Here's a common complaint I hear against nudism: "But if I see naked boobies all the time, it'll lose its excitement - I never want to reach a point where seeing naked boobies doesn't excite me!"
Response: I find it incredibly ironic (and not a little bit hypocritical) that the type of person who's constantly staring at women's chests and hoping for a nip slip would use this argument, seeing as I doubt it even factors into this person's logic when they are watching porn on the internet for hours at a time.
But while there is some legitimacy in the concept of "normalization" - that we tend to get used to things we are constantly exposed to - a human being need not fear "wearing out" their sexual appetite. Exposure to erotic triggers will, at best, tire you out temporarily; but, like hunger, there will always be more desire in store just around the corner.
I am a person who appreciates the naked human form - especially the female form. I have dedicated myself to art so that I may surround myself daily with depictions of that form. Through my appreciation of art, I see countless images of naked females almost every day. Do I ever get tired of seeing a beautiful naked woman?
The answer to that question is a resounding NO! Exposure hasn't diminished my appreciation for the human form - it has only refined it. It may be true that I don't get giddy at the mere sight of an exposed breast as if I were an adolescent boy. But in no way does that diminish my appreciation for a beautiful breast when I see it. In fact, I value that experience so much, I want the whole world to go naked so that I may indulge in it more often!
Frankly, I think we need more maturity when it comes to sex and the sight of the naked human body. Tittering at the sight of a naked breast is a phase that adult men need to grow out of. Seriously. It is at least partially responsible for the sort of ridiculousness that occurs in this country (the United States) when the nudity taboo is even barely broken - such as during the "nipplegate" fiasco. This fetishization and objectification of the human female breast also contributes to women's body image issues, sexual inequality in the form of resistance to topfreedom movements, and an unhealthy stigma attached to breastfeeding.
There's nothing wrong with a man finding a woman's breast - or any other part of her body - sexually appealing. But there is a mature and an immature way of handling it. And exposure is the best way to get past that awkward adolescent phase that our culture seems to be willfully stuck in. So, no, I don't think that coddling your unhealthy fascination with parts of people's bodies is a legitimate argument against the mainstreamification of nudism. But nice try.